Cycling around the frame is a tree that is going through the four seasons. Starting in winter with no leaves, buds start to grow and bloom into flowers. Then the flowers die away leaving vividly green foliage. After the peak of summer the leaves turn yellow, orange, and red before falling off and returning to winter.
- Instead of full blow trees, the object going through the seasons would be a twig with a single leaf/bud on it. Or a single flower.